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Is there anyway to know if the vaccines are effective against the new strains?

As mentioned elsewhere in this thread, this is a variant, not a strain.

This variant does not have any genetic differences in the spike protein targeted by the vaccines. It is unlikely the vaccines will be differently effective.

> Table 1 provides details of the B.1.1.7 lineage-specific non-synonymous mutations and deletions. We note that many occur in the virus spike protein.

https://virological.org/t/preliminary-genomic-characterisati...

There is no evidence for or against this, seeing as the mutation is at most ten weeks old.

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